Hey,
I just got an Adidas Teamgeist match ball from eBay, and I saw some things that made me doubt its authenticity. First the ball's thermal bonding is uneven at places, and in most places it’s even coming out. Second there are some winkles on the ball (I haven't pumped it up yet). But it was from a reputable seller and there is an authenticity sticker on it. Hope you guys can help, thanks.